Roles of the Rectal Gland and the Kidneys in Salt and Water Excretion in the Spiny Dogfish

Burger, J. Wendell

doi:10.1086/physzool.38.3.30152829

Cited by 91 publications

(17 citation statements)

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“…These findings are supported by previous reports on the rectal gland function in S. acanthias where an increase in secretion rate was observed following transfer of the fish to a reduced environmental salinity of 72-82% SW (Burger, 1965). In order to maintain the iso-or slightly hyperosmotic osmoregulatory strategy in dilute SW elasmobranch fishes reduce plasma Na + , Cl and urea independently of one another (Hazon & Henderson, 1984), and it would appear that the rectal gland plays a major role in the excretion of plasma Na + and Cl .…”

Section: Discussionsupporting

confidence: 92%

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Changes in chloride secretion rate and vascular perfusion in the rectal gland of the European lesser‐spotted dogfish in response to environmental and hormonal stimuli

Anderson

Good

Hazon

2002

Journal of Fish Biology

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Chloride secretion rates of rectal glands taken from the European lesser-spotted dogfish Scyliorhinus canicula adapting to 70% and 120% sea water (SW) were significantly greater and less than, respectively, those in the control 100% SW group. C-type natriuretic peptide (CNP) significantly increased chloride secretion rates above basal values in 100% SW although angiotenisn II (ANG II) had no effect. Perfusion of the secretory epithelia in rectal glands from 70% SW lesser-spotted dogfish was significantly higher than in rectal glands from 100% and 120% SW lesser-spotted dogfish. Perfusion of rectal glands with ANG II had no effect on perfusion of the secretory epithelia, although CNP perfusion induced significantly greater perfusion of the secretory epithelia than all other treatments. It remains to be determined if a reduction in environmental salinity induces an increase in plasma concentration of CNP and hence an increase in rectal gland activity.

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Section: Discussionsupporting

confidence: 92%

“…Interestingly, volume loading has also been shown to stimulate rectal gland function in S. acanthias (Burger, 1965;Solomon et al, 1985).…”

Section: Discussionmentioning

confidence: 99%

Changes in chloride secretion rate and vascular perfusion in the rectal gland of the European lesser‐spotted dogfish in response to environmental and hormonal stimuli

Anderson

Good

Hazon

2002

Journal of Fish Biology

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“…However, the rectal gland is apparently not the sole (or possibly even major) site of salt extrusion. Burger (1965) found that S. acanthias could maintain near normal blood Cl-levels after rectal gland extirpation and Chan et al (1967) showed that the lip shark, Hemiscyllium plagiosum, maintained normal Na + blood concentrations and Na 1 efflux after removal of the rectal gland.…”

Section: Elasmobranchsmentioning

confidence: 99%

Osmotic and Ionic Regulation by Freshwater and Marine Fishes

Evans

1980

Environmental Physiology of Fishes

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“…In this case one might speculate that proximal NaCI and fluid secretion in addition to glomerular filtration is advanta geous in that it assists the gills and the rectal gland in excreting NaCI and water. This interpretation might also explain why sharks survive the functional ablation of the rectal gland [9], Similarly in the winter flounder, the secretion of NaCI and fluid by the renal proximal tubules can be thought to assist the gills in the excretion of monovalent ions, particularly under the type of stressful condi tions that lead to the laboratory diuresis [21. 34].…”

Section: Nacl and Fluid Secretion In Glomerular Proximal Tubulesmentioning

confidence: 99%

Comparative Physiology of the Renal Proximal Tubule

Beyenbach¹

1985

Kidney Blood Press Res

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The comparative physiology of the renal proximal tubule (PT) is reviewed in the context of vertebrate evolution and vertebrate strategies of salt and water balance. Though extrarenal machanisms of salt and water balance contribute importantly to extracellular fluid (ECF) homeostasis in the lower vertebrates, the kidney acquires these functions with evolutionary progress and becomes the dominant organ of ECF homeostasis in mammals. In acquiring the major responsability over the ECF compartment the kidney favored filtration-reabsorption as the preferred mechanism for the rapid turnover of ECF with the advantage of providing quick renal regulatory responses. In spite of this specialization the structure and function of the PT do not appear to have undergone major evolutionary changes. In present-day vertebrates the PT remains as an immensely diverse transport epithelium with impressive capacities for both reabsorptive and secretory work, as exemplified by the mammalian PT with mostly reabsorptive functions and the PT of aglomerular kidneys with mostly secretory functions. The recent evidence for NaCl and fluid secretion in the PT of, unexpectedly, glomerular kidneys is consistant with the functional diversity and the conservative nature of evolution in the case of the PT.

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Roles of the Rectal Gland and the Kidneys in Salt and Water Excretion in the Spiny Dogfish

Cited by 91 publications

References 0 publications

Changes in chloride secretion rate and vascular perfusion in the rectal gland of the European lesser‐spotted dogfish in response to environmental and hormonal stimuli

Changes in chloride secretion rate and vascular perfusion in the rectal gland of the European lesser‐spotted dogfish in response to environmental and hormonal stimuli

Osmotic and Ionic Regulation by Freshwater and Marine Fishes

Comparative Physiology of the Renal Proximal Tubule

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